You can catch fish year round in the lagoon. Big fish are around all the time, you just have to know where to look, but they are way smart, like 40 lb bonefish smart, atleast if your throwing fly, so bring your A game.
Ohh, and all that stuff that looks "too skinny" by the banks, there is nothing too skinny in the lagoon, pole it next time and keep your eyes open, you got a 17.8!